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四川种主要土壤连续种植9季作物的钾耗竭试验结果表明:作物产量与作物吸钾是呈极显著相关;吸钾量与土壤速放钾呈显著相关,与缓效钾呈极显著相关。随着作物种植次数的增加,作物所需要的钾愈来愈依赖于土壤矿物钾的释放,产量相应呈直线下降;产量愈低,从土壤中吸取的钾愈少,缺钾症状出现愈早。以此为衡量土壤供钾能力。我们把供试土壤分为五类:第五类供钾能力最强,第四类次之,其余三类均缺钾,尤以第一类最缺。土壤速效钾80ppm、缓效钾400ppm可以作为土壤缺钾的临界值。
Potassium depletion test results showed that there was a significant correlation between crop yield and potassium uptake in crops. Potassium uptake was significantly correlated with potassium uptake in soil and significant correlation with slow-acting potassium. With the increase of crop planting times, the potassium required for crops relies more and more on the release of soil mineral potassium, and the yield decreases linearly. The lower the yield is, the less potassium is extracted from the soil and the earlier the potassium deficiency appears. As a measure of soil potassium supply capacity. We divided the soil for testing into five categories: the fifth is the strongest for potassium, the fourth is the second, and the other three are all deficient in potassium, especially in the first category. Soil available potassium 80ppm, slow-acting potassium 400ppm can be used as a critical value for soil potassium deficiency.